Er... why does this have to be "astrophysical sources"? In a particle accelerator, when an arcing occurs during, say, conditioning, you always get the light first and then the burst of charge later.Hello,
I would be interrested by some references comparing times of flight for photons and electrons.
Ideally, I would like to see that for different energies.
I would also prefer astrophysical sources, since the huge distances should increase the precision.